Add a configuration option for fullscreen locking

Some people are annoyed to have this new behaviour forced for some
application which use fake fullscreen.

add sway LICENSE file

part of the code in dwl is taken from sway, so credit it.
dwm and sway are both licensed under the MIT license

Merge pull request #137 from guidocella/libera

update IRC channel

Merge pull request #180 from Humm42/manpage

add dwl(1)

clients now works as expected in drag motion

implement drag and drop

For brevity, only a single drag icon at a time is supported.

Co-authored-by: Leonardo Hernández Hernández <leohdz172@protonmail.com>

Update issue templates

only skip frames if there are visible clients that have a resize

remove a useless resize in mapnotify()

applyrules() calls setmon() which calls resize()

improve floating detection

mostly copied from sway

destroy scene_output in cleanupmon()

Merge pull request #204 from djpohly/scenegraph3

merge scenegraph3

remove independents list

remove unneeded variables

attach presentation to scene

update README.md

Merge branch 'main' into scenegraph

do not allow set client size less than its min size

make sure to destroy wlr_scene_node of unmanaged clients

do not create borders for unmanaged clients